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<body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
<h2>MovingOnCurves</h2>

<p>In this example, the circles moves along the curve y = x^4.
Click the mouse to have it move to a new position.</p>

<p><a href="http://processing.org/learning/topics/movingoncurves.html"><b>Original Processing.org Example:</b> MovingOnCurves</a><br>
<script type="application/processing">
float beginX = 20.0;  // Initial x-coordinate
float beginY = 10.0;  // Initial y-coordinate
float endX = 170.0;   // Final x-coordinate
float endY = 180.0;   // Final y-coordinate
float distX;          // X-axis distance to move
float distY;          // Y-axis distance to move
float exponent = 4;   // Determines the curve
float x = 0.0;        // Current x-coordinate
float y = 0.0;        // Current y-coordinate
float step = 0.01;    // Size of each step along the path
float pct = 0.0;      // Percentage traveled (0.0 to 1.0)

void setup() 
{
  size(200, 200);
  noStroke();
  smooth();
  distX = endX - beginX;
  distY = endY - beginY;
}

void draw() 
{
  fill(0, 2);
  rect(0, 0, width, height);
  pct += step;
  if (pct < 1.0) {
    x = beginX + (pct * distX);
    y = beginY + (pow(pct, exponent) * distY);
  }
  fill(255);
  ellipse(x, y, 20, 20);
}

void mousePressed() {
  pct = 0.0;
  beginX = x;
  beginY = y;
  endX = mouseX;
  endY = mouseY;
  distX = endX - beginX;
  distY = endY - beginY;
}
</script><canvas width="200" height="200"></canvas></p>
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<pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a>
// unless otherwise stated.</b>
float beginX = 20.0;  // Initial x-coordinate
float beginY = 10.0;  // Initial y-coordinate
float endX = 170.0;   // Final x-coordinate
float endY = 180.0;   // Final y-coordinate
float distX;          // X-axis distance to move
float distY;          // Y-axis distance to move
float exponent = 4;   // Determines the curve
float x = 0.0;        // Current x-coordinate
float y = 0.0;        // Current y-coordinate
float step = 0.01;    // Size of each step along the path
float pct = 0.0;      // Percentage traveled (0.0 to 1.0)

void setup() 
{
  size(200, 200);
  noStroke();
  smooth();
  distX = endX - beginX;
  distY = endY - beginY;
}

void draw() 
{
  fill(0, 2);
  rect(0, 0, width, height);
  pct += step;
  if (pct &lt; 1.0) {
    x = beginX + (pct * distX);
    y = beginY + (pow(pct, exponent) * distY);
  }
  fill(255);
  ellipse(x, y, 20, 20);
}

void mousePressed() {
  pct = 0.0;
  beginX = x;
  beginY = y;
  endX = mouseX;
  endY = mouseY;
  distX = endX - beginX;
  distY = endY - beginY;
}</pre>
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